my g/f is having her period late

ok me and my g/f had sex, we used a condom but she was scared that the condom bust cause it didnt have a exp date. but it didnt bust cause when i took it off i did NOT see it busted

she was suppose to have her period but shes late - she thinks it could be moving from the middle of the month to maby the end or begining of the month. but we are still unsure

she hasnt shown many signs - only that shes eating more often -- and that she is a sleepy a little more. but other signs we havnt sceen yet.

we are just worried .... dose anyone think that she might be ? or that she is ?

please i need anything i can get to calm me and her down, thanks ever so much for looking into this and helping ( yall are life savers )